Double-method Comparative Study in Order to Predict the Use of Co-receptors From Type 1 HIV: Phenotypic Study (Trofile ESTA®) and Virologic Response to a CCR5 Antagonist in the Short Term

Inclusion Criteria: * Patients willing to give, sign and date the Informed Consent Form to participate in the Study and to donate their samples for cell and molecular Studies, after receiving the appropriate information about the Study design, the main objective of the Study and the potential risks. * Patients aged \>18. * Patients with chronic HIV infection * Patients with no previous HAART (naïve patients). * Patients that do not meet HAART starting criteria. * Viral load \>1.000 HIV RNA copies/mL * Patients able to understand the Study objectives and able to perform frequent visits to the Study Site. Exclusion Criteria: * Prior HAART (regardless of the HAART type). * Pregnancy or willingness to get pregnant during the Study.